Re: gtk3: Replaced PsppSheetView with GtkTreeView for the variables window

[Friedrich Beckmann]

Hi Ben, hi John,

i did some profiling on macos during scrolling and compared the gtktreeview and 
the psppsheetview. I used 2000 columns and 10000 rows. Approximately 80% of the 
time in the gtktreeview based version is spent in render_data_cell where data 
is retrieved from the store.

I did the same profiling during scrolling for the psppsheetview based 
implementation. Here 34 percent of the time is spent in render_data_cell.

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